JPH0643375U - Disc brakes for vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] To omit detailed settings such as set load from the spring used for the friction pad. Improves spring durability and material picking. Improves sliding performance of the friction pad and stability when sliding. [Structure] A spring accommodating space portion 11b is formed in an ear piece 11a of a back plate 11. A side surface 11c of the ear piece 11a in the disk circumferential direction, and an inner surface 11d and an outer surface 1 in the disk radial direction.
1e is provided with an opening 11f of the spring accommodating space 11b. The damper spring 14 is fitted into the spring accommodating space portion 11b, and the three top portions to be the guide portions 14a are
Each is projected from the opening 11f.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake for a vehicle used in a vehicle such as an automobile or a motorcycle, and more particularly to a structure for preventing a rattling noise caused by rattling of a friction pad.

[0002]

[Prior art]

 As a disc brake of the type that suspends the friction pad on the side of the disc rotor by locking the ear pieces protruding on both sides of the back plate of the friction pad to the groove-shaped pad guide portion formed on the caliper support arm. For example, there is one disclosed in Japanese Utility Model Publication No. 63-24269.

This disc brake uses a retainer and pad spring in which a U-shaped pad retainer and two pad springs are integrally formed to hold the friction pad, and the pad retainer is laid on the pad guide portion. Apply one of the pad springs to the disk circumferential side of the ear piece and the other of the pad springs to the disk radial inner surface to elastically support the friction pad to the disk circumferential direction and the radial outside. As a result, the rattling of the friction pad is suppressed, and the striking sound of the friction pad during braking and traveling of the vehicle is prevented.

[0004]

[Problems to be solved by the device]

 However, in such a configuration, it is necessary to set a set load for the friction pad for each pad spring, and for this setting, various factors such as the strength and area of the pad spring material and the set load for the friction pad are set. Had to be taken into consideration, and the setting was troublesome.

Further, in the above-mentioned retainer / pad spring, since the pad spring protrudes to the side of the pad retainer and the pad spring needs to have an elastic force, the projection piece having a length twice the projection length is folded back. Therefore, the developed shape was unique and the material selection was very bad. In addition, the pad spring with a small area always receives the load from the friction pad, so it has poor durability, and even if the pad retainer is not damaged, if the pad spring is worn out, the entire retainer / pad spring must be replaced. Was there.

The present invention has been made in view of such circumstances, and an object of the present invention is to suppress the rattling sound caused by rattling of a friction pad while eliminating the need for setting a set load of a spring or the like. , It is to provide a disk brake for a vehicle that can slide a friction pad satisfactorily.

[0007]

[Problems to be solved by the device]

 According to the above-mentioned object, the present invention provides a pair of caliper support arms extending from the outside of the disc rotor in the disc axial direction from a caliper bracket fixed to the vehicle body to groove-shaped pads facing each other on each side of the disc rotor. A disc brake for a vehicle in which a pair of friction pads are arranged opposite to each other on both sides of the disc rotor by forming a guide portion, and engaging the pad guide portion with ear pieces protruding on both sides of the back plate of the friction pad. In the above, the ear piece of the back plate is formed with spring accommodating space portions that open to the inner and outer surfaces in the radial direction of the disc and the side surface in the circumferential direction of the disc. , The guide portion that is a part of the damper spring is projected from the inner and outer surfaces of the ear piece in the disk radial direction and the openings of the disk circumferential side. Is characterized in that the placed.

[0008]

[Action]

 When a load is applied to the friction pad in the disk radial direction due to vehicle body running vibration, the guide part of the damper spring protruding from the side surface of the ear piece in the disk circumferential direction elastically abuts against the inner wall of the pad guide part. . Also, when the disc brakes apply braking action, the friction pads are slid in the disc extension direction due to the sliding contact with the disc rotor, and the guide part of the damper spring on the disc advancement side first moves to the pad guide part. The friction pad, which comes into elastic contact with the inner wall of the pad, then receives the braking torque, compresses the guide part of the damper spring and pushes it into the spring accommodating space, while moving in the disc feed-out direction. Gently abut the inner wall of the.

Further, when a load is applied to the friction pad in the radial direction of the disk due to traveling vibration of the vehicle body or the like, the guide portion of the damper spring that protrudes from the outer surface of the ear piece in the radial direction of the disk is fixed to the upper wall of the pad guide section. When the friction pad floats outward in the radial direction of the disc and descends from the state where the friction pad floats outward in the radial direction of the disc, the guide part of the damper spring protruding from the inner surface of the ear piece in the radial direction of the disc elastically moves to the lower wall of the pad guide part. Abut on each other to support the load of the friction pad.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

The disc brake 1 is provided with a caliper bracket 3 fixed to a vehicle body on one side of a disc rotor 2 which rotates in a direction of an arrow A, and the outside of the disc rotor 2 is fixed from the caliper bracket 3. A caliper body 4 is supported by a pair of caliper support arms 3a, 3a extending parallel to the disc axis via a pair of sliding pins 5 (one of which is not shown) so as to be movable in the disc axial direction. .

The caliper body 4 includes an action part 4 a arranged on one side of the disc rotor 2, a reaction part 4 b arranged on the other side of the disc rotor 2, and a reaction part 4 a on the outside of the disc rotor 2. And a bridge portion 4c which is connected across the bridge. The action portion 4a is provided with a cylinder hole 6 on the disk rotor 2 side, and the reaction portion 4b is provided with a reaction force claw 4d. A cylindrical piston 7 having a bottom is accommodated in the cylinder hole 6 so as to be liquid-tight and movable. The piston 7 is supplied to a hydraulic chamber 8 defined at the bottom of the cylinder hole 6. The liquid moves the cylinder hole 6 toward the disk rotor.

Between the piston 7 and the reaction force claw 4d, a pair of friction pads 9, 9 are arranged so as to face each other with the disc rotor 2 interposed therebetween. The friction pad 9 is formed by joining a lining 10 that is in sliding contact with the disc rotor 2 to a metal back plate 11, and ear pieces 11a and 11a are provided on both sides of the back plate 11 while the back plate 11 is provided with protrusions. A shim plate 12 is attached to the back surface of the plate 11. Further, the caliper support arms 3a, 3a are provided with pad guide portions 3b, 3b having U-shaped cross sections facing each other on each side of the disc rotor 2, and the friction pads 9, 9 described above are provided on both side portions. The ear pieces 11a, 11a are supported by the pad guide portion 3b via the pad retainer 13.

A spring accommodating space 11b is formed on the back side of each ear piece 11a, and the back side of the back plate of the damper spring 14 fitted in the space 11b is covered with the pad retainer 13 described above. I'm holding it. The spring accommodating space portion 11b has a vertical wall surface on the main body side of the back plate 11, and the inner side of the upper and lower corners of the ear piece 11a is cut into a taper shape to form a side surface 11c of the ear piece 11a in the disc circumferential direction. , An inner surface 11d and an outer surface 11e in the radial direction of the disk are provided with openings 11f, respectively, and when this spring housing space 11b is viewed from the back side of the ear piece 11a, an isosceles triangle is vertically arranged. It is a recess having a shape obtained by cutting the tops at three locations.

On the other hand, the damper spring 14 is formed by bending a strip-shaped spring plate into an isosceles triangle having the same shape as the spring accommodation space 11b. The damper spring 14 is disposed in the spring accommodation space 11b. When fitted, the three apexes serving as the guide portions 14a are arranged so as to project from the side surface 11c in the disk circumferential direction and the openings 11f in the disk radial inner surface 11d and the outer surface 11e. Further, the bottom portion of the isosceles triangle of the damper spring 14, which is applied to the vertical wall surface of the spring accommodating space portion 11b, has a shape in which the both ends of the spring plate are folded, and the middle portion is left open. When 14a receives an external force, a part of the damper spring 14 is easily bent into the spring accommodating space 11b.

In the damper spring 14 mounted in the spring accommodating space 11b of the ear piece 11a, the guide portion 14a protruding from the opening 11f of the disk radial inner surface 11d has the pad retainer 13 on the lower wall of the pad guide portion 3b. The ear piece 11 a is supported via the pad retainer 13 and is slightly raised from the lower piece of the pad retainer 13. Further, the remaining guide portions 14a, 14a may be slightly separated from the pad retainer 13 as shown in the respective drawings, or may be lightly contacted with the pad retainer 13.

The present embodiment is configured as described above, and when the friction pad 9 moves in the disk radial circumferential direction due to traveling vibration of the vehicle body or the like, it projects from the disk circumferential side surface 11c of the ear piece 11a. The guide portion 14a of the damper spring 14 elastically abuts the rising piece of the pad retainer 13 that covers the inner wall of the pad guide portion 3b, and absorbs the load of the friction pad 9.

Similarly, when the friction pad 9 moves outward in the disk radial direction due to traveling vibration of the vehicle body or the like, the guide portion 14a of the damper spring 14 protruding from the outer surface 11e of the ear piece 11a in the disk radial direction moves to the pad. The pad retainer 13 covering the upper wall of the guide portion 3b elastically abuts on the upper piece of the pad retainer 13 to absorb the load of the friction pad 9. When the friction pad 9 descends from this raised state, the guide portion 14a of the damper spring 14 protruding from the inner surface 11d of the ear piece 11a in the disk radial direction is below the pad retainer 13 that covers the lower wall of the pad guide portion 3b. It bears the load of the friction pad 9 by elastically abutting against one piece.

When a braking action is performed by the disc brake 1, the friction pad 9 is slid in the disc feeding direction by the sliding contact with the disc rotor 2 and the damper spring 14 on the disc feeding side has a disc circumferential direction. Guide portion 14a elastically abuts the rising piece of the pad retainer 13 that covers the inner wall of the pad guide portion 3b first, and then the friction pad 9 to which a braking torque is applied compresses the guide portion 14a. While pushing it into the sprinkle housing space 11b, it moves in the disc payout direction, and the side face 11c on the disc payout side of the ear piece 11a gently contacts the rising piece of the pad retainer 13.

As described above, in the present embodiment, when the friction pad 9 is loosened in the disc circumferential direction or the disc radial direction due to traveling vibration of the vehicle body or the like, the guide of the damper spring 14 protruding from the opening 11f of the ear piece 11a. Since the portion 14a cushions the contact, the tapping sound can be suppressed to an extremely low level. In addition, during braking, the guide portion 14a of the damper spring 14 and the side surface 11c of the ear piece 11a in the disc circumferential direction come into contact with each other in two steps, and the guide portion 14a in the first stage has a backlash in the disc circumferential direction. Similarly, the elastic force acts on the short movement stroke of the pad retainer 13 until the pad retainer 13 abuts against the rising piece, and the striking sound is suppressed, and in the second stage ear piece 11a, from the side surface 11c in the disk circumferential direction. The protruding guide portion 14a is gradually pushed into the spring accommodating space portion 11b and deforms to reduce the moving speed of the friction pad 9, so that the contact of the pad retainer 13 with the rising piece is buffered and the friction is reduced. The striking sound of the pad 9 is also extremely small.

Further, the damper spring 14 of the present embodiment only needs to be fitted in the spring accommodating space portion 11b of the ear piece 11a, and the setting load etc. for the friction pad 9 required for the conventional pad spring is set. Is unnecessary. Furthermore, the simple shape makes it an excellent material picker. Further, since it does not receive an excessive load from the friction pad 9, it has excellent durability, and it is separated from the pad retainer 13 and can be replaced individually, which is economically advantageous.

5 to 7 show another embodiment of the present invention, in which the spring accommodating space 11g of the ear piece 11a includes a side surface 11c in the disk circumferential direction, an inner surface 11d and an outer surface 11e in the disk radial direction. In each of the three positions, a groove is formed in the thickness direction of the ear piece 11a. On the other hand, the damper spring 15 includes linear guide parts 15a, 15b, 15c, connecting parts 15d, 15d for connecting them, and hooking parts 15e 1, 15e at both ends for folding a single linear spring material. It is formed by bending.

In the damper spring 15 described above, the guide portions 15a, 15b, 15c are fitted into the spring accommodating space portions 11g, respectively, and the hook portions 15e, 15e at both ends are provided on the front surface and the back surface of the ear piece 11a. It can be attached by hanging. Each of the guide portions 15a, 15b, 15c is elastically fitted such that at least a part of the guide portion 15a, 15b, 15c projects outward from the opening of the spring accommodating space portion 11g.

Further, between the guide portions 15a, 15b, 15c and the bottom wall of the spring accommodating space portion 11g, the guide portions 15a, 15b, 15c receive an external force and are pushed inside the spring accommodating space portion 11g. In this case, the guide portions 15a, 15b, 15c have a space for accommodating the side surface 11c in the disk circumferential direction of the ear piece 11a, the inner surface 11d in the disk radial direction, and the outer surface 11e. The same effect as that of the above-described embodiment is obtained.

The pad retainer used in the above-mentioned embodiments may be omitted. Further, according to the present invention, the guide portion of the damper spring may be projected from three positions, that is, the side surface of the back plate ear piece in the disk circumferential direction and the inner surface and the outer surface of the disk radial direction. The shape is not particularly limited to the example.

[0026]

[Effect of device]

 As described above, according to the present invention, the ear piece protruding from the back plate of the friction pad is formed with the spring accommodating space opening to the inner and outer surfaces in the disk radial direction and the side surface in the disk circumferential direction. By mounting the damper spring in a retractable manner in the accommodation space and arranging the guide portion that is a part of the damper spring so as to project from the inner and outer surfaces of the ear piece in the disk radial direction and the opening of the disk circumferential side surface, The striking sound of the friction pad is prevented during braking and non-braking.The damper spring only slows down the moving speed of the friction pad during braking, and it is not necessary to apply the spring load to the friction pad. Compared with the conventional pad spring, it is not necessary to make detailed settings such as the set load on the friction pad, and the design, manufacture and assembly can be performed roughly. Can.

Further, since the damper spring does not receive an unreasonable load from the friction pad, it has excellent durability, and moreover, a spring plate or a spring wire can be used as the damper bling material. Since the shape is simple, it is excellent in material selection.

Further, instead of the tabs of the friction pad, any one of the three guide portions of the damper spring guides the movement of the friction pad, so that the sliding property and stability of the friction pad are improved, and the pad is improved. It is less likely that the pressing force will be consumed by the frictional resistance and the braking force will be lost.

[Brief description of drawings]

FIG. 1 is an enlarged front view of an essential part of a disc brake showing an embodiment of the present invention.

FIG. 2 is a half sectional rear view of a disc brake showing an embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a perspective view of a main part of a friction pad showing an embodiment of the present invention.

FIG. 5 is a sectional front view of a main part of a disc brake showing another embodiment of the present invention.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a perspective view showing a main part of a friction pad according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper bracket 3a ... Caliper support arm 3b ... Pad guide part 4 ... Caliper body 9 ... Friction pad 10 ... Lining 11 ... Back plate 11a ... Back plate 11 ear piece 11b ... Ear piece 11a 11c ... Inner surface of ear piece 11a in the disk radial direction 11e ... Outer surface of ear piece 11a in the disk radial direction 11f ... Guide portion 14a of damper spring 14 12 ... Shim plate 13 ... Pad retainer 14 ... Damper spring 14a ... Guide part provided on damper spring 14 A ... Rotation direction of disk rotor 2

Claims (1)

[Scope of utility model registration request] 1. A pair of caliper support arms extending outside the disc rotor in the disc axial direction from a caliper bracket fixed to a vehicle body is provided with groove-shaped pad guide portions facing each other on each side of the disc rotor. Then, in the disc brake for a vehicle in which the pair of friction pads are arranged to face each other on both sides of the disc rotor by locking the ear pieces protruding to both sides of the back plate of the friction pad to the pad guide portion. A spring accommodating space portion that is open to the inner and outer surfaces in the radial direction of the disc and the side surface in the circumferential direction of the disc is formed in the ear piece of the disc, and the damper spring is mounted in the spring accommodating space portion in a contractible manner. A guide portion, which is a portion, is arranged so as to project from the inner and outer surfaces of the ear piece in the disk radial direction and the openings of the disk circumferential side surface. Disc brakes for vehicles.